Needle-thread-controlling device for sewing machines



W. N. PARKES Sept. 16, 1930.

NEEDLE THREAD coNTRoLLING DEVICE Fox SEWING uAcHINEs Filed Jan. 15, 1929Patented Sept. 16, 1930 NETE TATES PATENT GFFICE WILLIAM NELSON PAEKES,OF BROOKLYN, NEV YORK, ASSIGNOR T THE SINGER MANUFACTURING COMPANY, GFELZABE'll-I,

JERSEY NEW' JERSEY, A CORORATION OF NEW' NEEDLE-THREAD-GONTROLLEG-DEVECE .FOR SEVNG IVIACHINES Application filed January 15, 1923.

U facilitating the casting of the needle-thread loop about thelower-thread mass. lt is the object of this invention to provideneedlethread loop-controlling means insuring the rapid spreading of theloops in the preliminary stages of casting said loops about thelower-thread mass.

To the attainment of the object of the invention, the throat-plate ofthe machine is provided on its underside with a depending lug positionedto overlie the beak of the loop-taker as said beak enters theneedlethread loop. This lug presents an abutment face for theneedle-thread loop seized by the loop-taker whereby, in the continuedrotation of the loop-taker, said thread-loop is forced rapidly along theinclined side or sides of the beak toward the throat thereof.

To accommodate the upward movement of the limb of the seized thread-loopwhich is cast across the upper rim of the thread-mass carrier, theabutment face of the lug is inclined downwardly toward the rear edge ofthe lower corner thereof nearest to the looptaker axis and the loweredge of the lug is inclined upwardly towards that corner. Thethroat-plate lug is furthermore provided with a vertically directedgroove adjacent the throat-plate needle-aperture upon the side of theneedle opposite to t-he looptaker side thereof for the purpose ofreceiving a limb of the needle-thread loop during the formation thereof,thereby directionally controlling the position of the other limb forentrance by the loop-taker beak. To this end, the lug has a portionextending substantially at a right angle to the abutment face of thelug, in which lug portion the thread-guiding groove referred to isprovided.

In the accompanying drawings, Fig. 1 is Serial No. 332,813.

a front elevation, partly in section, of the loop-taker end of a sewingmachine containing the present improvement. Fig. 2 is a top plan view ofthe cloth-plate of the machine, with the usual slide-plate omitted toexpose the loop-taker mechanism. Fig. 3 is a bottom plan view of thethroat-plate of the sewing machine. Fig. fl is a perspective view of theportion of the throat-plate having the needle-thread loop controllinglug. Certain features of this loop-taker mechanism arc shown more indetail in an application filed Jan. 15, 1929, with Serial No. 332,610.

Referring to the drawings, the present iinprovement is shown as embodiedin a sewing machine having a cloth-plate 1, upon which is suitablysecured a throat-plate 2 and the slide-plates 3 and l, disposed atopposite sides of the throat-plate. The throat-plate 2 is provided withthe usual aperture 5 for a vertically reciprocatory needle 6, and withparallel slots, as 7, in which operates a feeddogl .8 which may beactuated in any welll-:nown manner to advance the work. Opposed to thefeed-dog is the usual presserfoot 9.

Suitably secured to the underside of the cloth-plate is. a loop-takerbracket in which i fixed a bushing 11 constituting the journal for theforward end of a horizontally disposed actuating shaft 12, which rotatesonce only for each complete needle-reciprocation. Secured upon the endof the shaft 12 is a bevel-gear 18 in mesh with a similar gear 14 uponthe vertically disposed loop-taker shaft j-ournaled in the bracket 10.The gears 13 and 14; are proportioned to impart two rotations to theshaft 15 for each rotation of the actuating shaft 12.

Detachably secured to the upper end of the shaft 15 is. av loop-taker 16provided with a loop-seizing beak 17 of which one side 18 is inclineddownwardly from the point of the beak toward the throat 19 thereof, i.e., inclined downwardly toward the bottom of the loop-taker. Theloop-taker 16is also provided with a loop-discharging spur 2O directedoppostely to the beak 17 and upon which .spur the needle-thread looppasseswhen it is 'drawn off said beak 17.

Journaled within the loop-taker 16 is a bobbin-carrier 21 within whichis disposed a thread-carryingb-obbin 22.- rlhe bobbin-czarrieris'provided with flangesk 23 and 24, extending above the orbit ofthelloop-taker beak. The flange 23 Visdisposed at the loop i cast-'offisideof the loop-taker and-terminates at its opposite ends-in stop-'shoulders25 and 26, the stop-shoulder 25 beingpositioned to engage a stop-lug 27,depending from the throat-plate, whereby Vthe bobbin-carrier isrestrained against rotation with the looptaker. The stop-shoulder 26isadapted to engage a fixed' stop-inger28 to limit the rotation ofthebobbin-carrier in a directi-on opposite to the direction of rotationof the looptaker. k,'Iheothery flange 24' of the bobbincarrieri's'disposed at the loop cast-on side of the,loop-takerand terminates ina stop-shoulder '29 which is intermittently engaged by an opener-finger30 suitably actuated to'oscillate fthe bobbin-carrier in a direction tovprovide a thread-loop passage past the stop-lug 27. f By referring toFig. 2 ofthe drawings, it will'be observed that the loop-taker axis isdisposed in 'a vertical plane extending through the throatplateneedle-aperture in a direction substantially transverse to the directionof feed.' f L Depending from the under side of `the i throat-plate 2 isa needle-thread 'loop control-V f'linglug 31 in position to overlie thelooptaker beak as it is entering the needle-thread loop; This lug 31hasa'front loop-abutment face 32 extending` generally `,transversely of thelength of the feed-slots 7 and disposed directly rearward of the'needle-aperture 5,

said abutment face being inclined downward- Yly in a direction towardthe lower rear edge of the lug and also inclined-laterally toward therear. corner of the edge nearest the looptaker axis. Furthermore, thelower edge of' the lug is inclined upwardly from the needle-aperturetoward the-lug-edge nearest to ment of the :loop-limb cast acrossthe'upperk As the loop-taker beak 17 enters the loop of thread presentedby the needle, it carries the loop against the abutment-face 32 of thelug.

The loop being thus held against freely following the point of the beak17, said loopy is forced toward the throat 19 of thebeak vand istherefore-rapidly spread to facilitate the casting ofthe loop about thebobbin-carrier.H The describedinclines ofthe abutment-face are 'designedto accommodate theseparation ofthe loop-lnnbs during the loop-spreadingoperation and partlcularly'the upward moveside of the bobbin. y n

Upon the side of the needle-aperture 5 directly opposite to theloop-taker side thereof,

the lug 81 is-provided with alug-extension 33 disposed substantially-atright angles tothe abutment-face'52.k 'Formed in this lug-extension onthe side thereof next to the throatplate needle-aperture is a verticallydisposedV groove 34 adapted'to receive a limbv of the needle-thread loopand thereby. directionally present the other limb for entrance byV theloop-taker beak.

Having thus set inventionv what I claim herein is: d i 1. ln asewingmachine hav'ng aV throatplate provided with' a needle-aperture, athread-carrying needle reciprocating Vthrough said aperture, avertical-axis rotary loopforth the nature of the L taker below thethroat-plate having a loopi seizing beak of which one sideis inclineddownwardly vfrom its point towardy the throat thereof, yaibobbin-carrierjournaled in'said loop-taker, and a thread-loop controlling 'lugdepending from the t-hroat-plate in position to overlie theloop-taker'beak vas it enters the needle-thread loop, a face of said lugconstituting an abutment which in the continued rotation of theloop-taker forcesa vlimb of 'the needle-threadloop toward the throat ofthe beak-to thereby assist inV rapidly spreading said needle-threadloop, the abutment face of said lug being inclined downwardlyV towardtheopposite face of the lug-andthe lower edge'of said facebeing inclinedupward-v ly toward the bobbin-carrier to provide for the upward movementof the limb of ythe .neeelle-thread loop cast across the upperside of'the bobbin-carrier. c

2.. In a sewing vmachine having. a throatplate provided with aVneedle-aperture, a thread-carrying needle reciprocating through saidaperture, a vertical-axis rotary loop-taker below the throat-plate,provided with a loop-seizing beak, a bobbin-carrier journaled f f insaid loop-taker extending above the 'orbitof the loop-taker beak, andathread-loop con-V trolling lug depending from the throat-plateV inpositionto overlie the ,loop-'taker beak as it enters theneedle-threadloop, said lug having a needle-'thread loop abutment facelextendintg`generally transversely ofthe throatplate irectly rearward of'saidneedle-apertureandsaid abutment face being inclined i in' substantiallytransverse directions toward the lower rear corner of the lug nearestthe loop-taker .axis to ,providev for ythey-upward movement of the 'limbof ftheneedle-thread loop cast across the upper side ofthebobbintooverlie the loop-taker beakas it enters'the i needle-'thread loop,lafaceof said lugcon-V WILLIAM NELSON PARKES.

